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The answer is 20 .. because the half of 8 is 4  then times the 5 yrs ago equals 20

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answer to choose are A.18 B.20 C.16 D.30
B. po ..
Let x be John's age today. Five years ago, John's age was x -5.
In eight years, John's age will be x+8.
Therefore, the statement "5 years ago John's age was half of the age he will be in 8 years" written in symbols is:
x- 5 = \frac{1}{2} (x+8).
Multiplying both sides by 2, we have 2x-10 = x+8
which gives x = 18.
Therefore, John is 18 years old today.
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